Top 10 Brother MFC 7840W Printer Questions & Answers

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Question

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Brother MFC-7840w wireless printer won't connect to network

I have a Brother MFC-7840w wireless printer. I'm trying to connect to a 2wire wireless router. In the setup wizard on the printer control panel it detects my wireless network, says connecting, then gives the connection NG message. I contacted Brother support, they pointed the finger at my 2wire router (which kind of made sense considering the printer could see my network) so I called at&t (uverse) support and they pointed the finger right back at Brother. I'm hesitant to make changes on my router firewall without knowing more about what I'm doing...do you think it's simply my router firewall?...I have a desktop hardwired to the router using a powerline connection, a wireless laptop, and an apple itouch. Neither of my wireless devices had any trouble accessing my network...just the printer....
any assistance would be appreciated. Thank You.

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Answer

  • Most Helpful of 17 Answers

Ignore the instructions that come with the printer, choose Open System, then choose WEP, enter, and it hooks up. Thanks to the above posters for this solution.

Posted on Oct 18, 2009

Question

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"brother mfc 7840w printer goes offline and i cannot print need turn printer on and off.

"brother mfc 7840w printer goes offline" Problem

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The solution, and it took me a long time to find the simple solution, is to right click on your printer, click properties, click the ports tab and click on your Brother printer and click on configure port (or you can delete the existing one and then add another one). What you want to do is update the IP Address. The problem is that the printer does not have a static IP address, it is dynamic. If you want to confirm that, go to your printer and press the reports button and print out the network configuration report. Your IP address will show on that. It's really the last digit in the IP address that changes. This will absolutely solve your problem. Good Luck!

Posted on May 17, 2009

Question

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Why does my Brother printer

Why does my Brother printer goes into Sleep mode and I can't print??

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Answer

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If NONE of the other solutions worked for you, then you may have a Windows-specific network issue.
Try this: Print to your Brother printer when in Sleep mode. If Printer remains offline, SHUT DOWN the device. Wait a few seconds, then START Windows (not a Restart). If the printer prints your job from the "Welcome" screen, you have the same problem I have - this is a Windows-only problem.

I uninstalled/reinstalled the latest Brother printer driver for Windows 7. This had no effect.
Other observations:
1. All other Mac/Apple devices on my home network print to the Brother when in sleep mode, no problems.
2. My Verizon wireless router is turned off at night, and restarted in the morning. I though this caused a network issue with the printer, but the problem persisted when leaving the router powered on 24/7.
3. Ping test from the Verizon Router Admin account to the Brother printer is successful (remember Mac's work just fine).
4. Ping test from Windows 7 PC to the the Brother Printer is successful.
No Network connectivity issues were detected. Then out of frustration I shut down Windows and walked away. Upon starting windows from a full shutdown (not a restart), the Brother printer woke up and printed all my open print jobs!!

If I find a permanent solution I will post. The only change between working and not working was a Microsoft Windows 7 Update. I will try to update the Brother Firmware to see if this resolves.

Michael

Posted on Jan 25, 2014

Question

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Drum Error on Brother MFC 7840W

Drum Error on Brother MFC 7840W

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Answer

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Has two situations:

  1. The corona wire on the drum unit needs to be cleaned.Clean the corona wire on the drum unit.
  2. The drum unit has reached the end of its life. Replace the drum unit.

Posted on Feb 15, 2010

Question

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I replaced the toner for brother MFC 7860DW and

I replaced the toner for brother MFC 7860DW and still getting replace toner message. I cannot print. Please help. thanks

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Answer

  • Most Helpful of 2 Answers

1. lift lid and open front cover

2. press clear/back. "Replace Drum?" will appear on the screen.

3. Press "*00" it will then read accepted and the toner low error (End
of Toner Life) should go away.

4. close it all up and your done.

Posted on May 12, 2013

Question

  • 10,697 People Helped

MFC-7840w keeps saying "toner life end"

I recently ran out of toner in my cartridge and used a co-workers to print. After I used up the co-workers toner, I put a new one into the machine, but machine keeps saying "Toner life end." I can't get it to print! I've tried putting the cartridge into my co-workers, and it works in her machine. I can't get my machine to work again! What gives?

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Answer

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After I figured this out, it was quite easy to resolve. Remove the toner cartridge from the drum cartridge. Remove the black plastic cover on the left side of the toner cartridge (3 Phillips screws). There is a "flag", which is a small plastic tab on the outer side set to the right at about 2 o'clock. Turn the gears until you fully reset the tab going counterclockwise to the 10 o'clock position (fully to the left). Reinstall the small black cover and the three phillips screws. And the idea to install black electrical tape over the small clear plastic windows on both sides is also a good idea to prevent the early and false message that the cartridge is empty. Make sure you do not allow that tape to get into the gears.

Posted on Sep 19, 2010

Question

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How do you reset a Brother MFC-7840W printer to

How do you reset a Brother MFC-7840W printer to factory default settings?

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Answer

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Menu * 2864 (within 2 sec.), 0,1, when 'maintenance' appears, press 0,9 to exit.

Posted on Dec 11, 2009

Question

  • 9,508 People Helped

how to scan with brother mfc 7840w

how to scan with brother mfc 7840w

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Answer

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Just put the scan job in the scanner and press the scan tab in your printer the scan image will appear in your directly connected machine/pc.

Posted on Jul 18, 2010

Question

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how do I reset the drum counter on the a Brother

How do I reset the drum counter on the a Brother MFC-7840W???

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Answer

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open the front cover of machine ( where the cartridge is installed), then press the clear button, and then press 1 for yes for change drum question.

Posted on May 16, 2010

Question

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Drum error message

I changed the drum roller and still says Drum error. Is there a way to reset the drum...I have printed a lot of copies but very small amount of actual print.

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Answer

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To reset MFC-7840W drum count use the following steps.

1. open the front cover (leave open).
2. Press clear/back.
3. Then confirm the new drum install by pressing 1.
4. The display will indicate accepted.
5. Then close the front cover.

This should be done each time the drum unit is replaced.

Posted on Jun 18, 2010

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